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Re: [avr-gcc-list] PEN on atmega128

From: Brian Dean
Subject: Re: [avr-gcc-list] PEN on atmega128
Date: Sun, 5 Jun 2005 10:02:40 -0400
User-agent: Mutt/

On Sat, Jun 04, 2005 at 12:17:35PM -0700, Jamie Morken wrote:

> Does PEN need to be tied to GND for the SPI 
> programming interface to work on the atmega128? 

No ... just let it float.  It has an internal pull-up so unless you
actually need it as an alternative to /RESET enter programming mode,
then it doesn't really serve a purpose.

Plus, if you leave it unconnected you can drop in an ATmega2561 part
without worries since that pin becomes PORTG5 on which serves the
additional special function of another output compare pin (OC0B).

Brian Dean
BDMICRO - ATmega128 Based MAVRIC Controllers

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